Energy shift of magnons in a ferromagnetic spinor-dipolar Bose-Einstein condensate
arXiv:1502.04161 · doi:10.1103/PhysRevA.91.041603
Abstract
Motivated by the recent experiment performed by the Berkeley group [G. E. Marti {\it et al.}, Phys. Rev. Lett. {\bf 113}, 155302 (2014)], we consider the dynamics of magnons in a spin-1 spinor-dipolar Bose-Einstein condensate, using mean-field theory. We show that the effective mass of a magnon is increased by the magnetic dipole-dipole interaction, as observed in the experiment. The magnon mass is also decreased by changing the direction of the magnetic field. The increase and decrease in the magnon mass manifest themselves in the acceleration of the magnons.
arXiv comment5 pages, 3 figures, 2 movies; numerical results corrected
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